GB882101A - Organosilicon compounds and processes for producing the same - Google Patents

Abstract

A silane of the formula <FORM:0882101/IV (a)/1> wherein R is a monovalent substituted or unsubstituted hydrocarbon radical, R1 is H or R, each R3 is H, a monovalent hydrocarbon radical or the radical <FORM:0882101/IV (a)/2> each X is a halogen atom or an alkoxy radical, and a is 0, 1 or 2, is made by admixing a silane of the formula R2aHbSiX4-a-b, wherein each R2 is a monovalent hydrocarbon radical, b is 1, 2 or 3 and a+b\s93, with aliphatic, aromatic or halogenated aliphatic hydrocarbons, or aliphatic cyclic and linear ethers as solvent, and an acrylate of the formula <FORM:0882101/IV (a)/3> and causing the silane and acrylate to react in the presence of a platinum catalyst. Optional substituents on R radicals are halogen, nitro, amino, ether, ketone and aldehyde. The process is effected by adding the acrylate to a refluxing mixture of the silane, solvent and catalyst, with subsequent recovery, e.g. by vacuum distillation, of the silane ester. The effects of using different solvents in varying amounts are discussed. The chlorosilanes produced may be esterified with monohydric alcohols to give the corresponding alkoxy silanes, or the products in general may be transesterified with alcohols or be reacted with acids and esters to yield silanes and siloxanes useful as lubricants, cosmetics, ultra-violet absorbers, chelating compounds and anti-foam agents. The silanes and siloxanes may be used for sizing fibrous glass materials. The silanes can be hydrolyzed to the corresponding carboxylic acid-substituted siloxanes, e.g. by refluxing with an aqueous alcoholic alkaline solution. Alternatively they may be hydrolyzed to give hydrolyzates which can be distilled to recover the pure cyclicsiloxanes. The resulting siloxanes may be co-polymerized with other siloxanes, or the copolymers may be made by co-hydrolysis of the corresponding silanes. Examples describe the preparation of (1) a - and b -carbethoxyethylmethyldichlorosilanes; (3) a -and b -carbethoxyethyltrichlorosilanes; (4) b -carbethoxyethyldichlorosilane; (5) a - and b -carbomethoxyethylmethyldichlorosilanes; (6) b -carbethoxyethylphenyldichlorosilane; (7) b -carbethoxyethylmethylsiloxane cyclic tri-, tetra- and pentamers; (8) b -carbethoxyethylphenylsiloxane cyclics; (9) b -carbomethoxyethylmethyldiethoxysilane; (10) b -carbethoxypropylmethyldichlorosilane and (11) the corresponding diethoxysilane; (12) b -carbethoxypropyltrichlorosilane and (13) the corresponding triethoxysilane; (14) b -carbethoxypropylmethylsiloxane; (15) b -carboxypropylsiloxane; (16) b -carboxypropylmethylsiloxane; (17) b -carbethoxypropylsiloxane; (18, 19, 20) b -carboxypropylmethylsiloxanedimethylsiloxane copolymers; (21) trimethylsiloxy end-blocked copolymers of (18); (22, 23) as in (21) except that the functional radical is b -carbethoxypropyl; (24) b -carbethoxypropylmethylsiloxane-dimethylsiloxane copolymer; and (2) describes the purification of the b -isomer of (1) by decomposition by heat of the a -isomer. The subject-matter of Specifications 804,097 and 804,098 is disclaimed.